Armor-Piercing Capped Shell Technology ID
The research ID for Armor-Piercing Capped Shell in Hearts of Iron IV is basic_heavy_shell.
Armor-Piercing Capped Shell

Naval support1936
Unlock this technology with the research command and the tech ID basic_heavy_shell.
About this technology
By fitting a ballistic hood, shells can be made more aerodynamic while still maintaining their armor-piercing performance.